Wakkanabi Formation, Ishikari Group - Sorachi district: Lutetian, Japan

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Cipangopaludina ? ishikariensis
Cipangopaludina jimboi
Bivalvia - Carditida - Carditidae
Venericardia otatsumei Uozumi 1955
Bivalvia - Carditida - Crassatellidae
Crassatellites yessoensis
synonym of Crassatella
Bivalvia - Pholadida - Myidae
Mya ezoensis Nagao and Inoue 1941
recombined as Mya (Arenomya) ezoensis
Bivalvia - Cardiida - Mactridae
Spisula sorachiensis Otatsume 1933
Bivalvia - Cardiida - Veneridae
Cyclina shirokiana
Pitar sannosawaensis
Pitar sorachiensis Oyama and Mizuno 1958
Microcallista munroei
spelled with current rank as Callista (Microcallista)
Bivalvia - Cardiida - Corbiculidae
Geloina takaoi
spelled with current rank as Polymesoda (Geloina)
Geloina hokkaidoensis
spelled with current rank as Polymesoda (Geloina)
Corbicula tokudai
Bivalvia - Cardiida - Psammobiidae
Soletellina shimogawarai
Soletellina otatsumei
Bivalvia - Lucinida - Lucinidae
Claibornites quinquangulus Uozumi 1955
Bivalvia - Mytilida - Mytilidae
Brachidontes ogasawarai
Brachidontes sakakurai
Bivalvia - Ostreida - Pteriidae
Margaritifera otatumei
synonym of Pinctada
Margaritifera perdahurica
synonym of Pinctada
Bivalvia - Ostreida - Ostreidae
Ostrea eorivularis Oyama and Mizuno 1958
Gastropoda - Viviparidae
Bellamya mabutii
Gastropoda - Neotaenioglossa - Calyptraeidae
Calyptraea sorachiensis Oyama and Mizuno 1958
Gastropoda - Batillariidae
Pyrazus miyajimai
Gastropoda - Perissityidae
"Siphonalia" ishikariensis
"Siphonalia" sakakurai Mizuno 1954
Gastropoda - Fasciolariidae
Polinices nagahamai
see common names

Geography
Country:Japan
Coordinates: 43.5° North, 142.0° East (view map)
Paleocoordinates:46.7° North, 136.4° East
Basis of coordinate:based on nearby landmark
Geographic resolution:local area
Time
Period:Paleogene Epoch:Eocene
Stage:Lutetian 10 m.y. bin:Cenozoic 2
Key time interval:Lutetian
Age range of interval:47.80000 - 41.20000 m.y. ago
Stratigraphy
Geological group:Ishikari Formation:Wakkanabi
Stratigraphic resolution:formation
Stratigraphy comments: STRATIGRAPHIC RELATIONS: From Wakkanabi Fm, which overlies the Yubari and underlies the Bibai Fm, all of the Ishikari Gp (Middle Eocene). THICKNESS: From unit which reaches a thickness of 100-250 m. AGE: early Middle Eocene according to Takano and Waseda (2003). Referred only to Eocene in Mizuno (1964). STRATIGRAPHIC POSITION: Composite checklist for formation from local area.
Lithology and environment
Primary lithology: lithified siltstone
Secondary lithology: sandstone
Includes fossils?Y
Lithology description: SPECIFIC LITHOLOGY: Siltstone and sandstone. LITHIFICATION: Assume to be lithified on the basis of age and photgraphic plates of Takano and Osamu (2003).
Environment:marginal marine indet.
Geology comments: ENVIRONMENT: Marine and non-marine faunal assemblage.
Taphonomy
Modes of preservation:body,cast,mold/impression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Collection method comments: COLLECTOR: T. Mizuno (c. 1960's). REPOSITORY: Unknown, not stated in text.
Taxonomic list comments:COVERAGE: Exhaustive for bivalvia and gastropoda. NOMENCLATURE: Somewhat antiquated, but with species-level identifications.
Metadata
Database number:70900
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2007-04-11 08:30:38 Last modified:2013-11-25 13:37:23
Access level:authorizer only Released:2008-04-11 08:30:38
Creative Commons license:CC BY
Reference information

Primary reference:
23771. A. Mizuno. 1964. Summary of the Paleogene molluscan faunas in North Japan. Geological Survey of Japan Report 207 [A. Hendy/A. Hendy/A. Hendy]